#include <iostream>

int const n = 50;
int vis[n + 1];

int main()
{
	bool opt = true;
	for (int i = 1, x; i <= n; i++) {
		std::cin >> x;
		if (vis[x]) {
			std::cout << x << "  fuck!\n";
			opt = false;
		}
		vis[x] = true;
	}
	if (opt) std::cout << "true!";
}
